The correct answer is (a) V.V. Giri.
V.V. Giri was the fourth President of India. He was a trade union leader and a lawyer. He was the first President of India to be elected by an electoral college consisting of members of both houses of Parliament and the legislative assemblies of the states.
N. Sanjiva Reddy was the fifth President of India. He was a politician and a lawyer. He was the first President of India to be elected by an electoral college consisting of members of both houses of Parliament and the legislative assemblies of the states.
K.R. Narayanan was the ninth President of India. He was a politician and a diplomat. He was the first Dalit to be elected President of India.
Zakir Hussain was the third President of India. He was a politician and a scholar. He was the first Muslim to be elected President of India.
V.V. Giri was the only President of India who was associated with the trade union movement. He was a trade union leader and a lawyer. He was the first President of India to be elected by an electoral college consisting of members of both houses of Parliament and the legislative assemblies of the states.